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Daca a+b=15 si c×d=8 calculeaza:a×c×d+b×c×d+c×(a+b)×d×(a+b). Urgent!!!

Răspuns :

LeoJoJo

[tex]a \times c \times d + b \times c \times d + c \times (a + b) \times d \times ( a + b) = [/tex]


[tex] = (c \times d)(a + b) + (a + b)(c \times d) = [/tex]

[tex]8 \times 15 + 15 \times 8 = 120 + 120 = 240[/tex]

[tex]c \times d(a + b) + c \times d {(a + b)}^{2} = 8 \times 15 + 8 \times {15}^{2} = 120 + 8 \times 225 = 120 + 1800 = 1920[/tex]

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